import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/welcome.vue'
import Users from '../components/user/Users.vue'
import Rights from '../components/power/Rights.vue'
import Roles from '../components/power/Roles'
import Cate from '../components/goods/Cate.vue'
import Params from '../components/goods/Params.vue'

Vue.use(VueRouter)

const routes = [

]

const router = new VueRouter({
  routes: [{
      path: '/',
      redirect: '/login'
    },
    {
      path: '/login',
      component: Login
    },
    {
      path: '/home',
      component: Home,
      redirect: '/welcome',
      children: [{
          path: '/welcome',
          component: Welcome
        },
        {
          path: '/users',
          component: Users
        },
        {
          path: '/rights',
          component: Rights
        },
        {
          path: '/roles',
          component: Roles
        },
        {
          path: '/categories',
          component: Cate
        },
        {
          path: '/params',
          component: Params
        }
      ]
    }
  ]
})


const originalPush = VueRouter.prototype.push
VueRouter.prototype.push = function push(location) {
  return originalPush.call(this, location).catch(err => err)
}

//挂载路由导航守卫
//to表示将要访问的路径  from 代表冲那个路径跳转过来 
// next是一个函数，表示放行 next() 放行 next('/login') 强制跳转
router.beforeEach((to, from, next) => {
  if (to.path === '/login') return next()
  //获取token值
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})


export default router